Black, triangle, batman shaped object flew several hundred yards in front of vehicle in an almost arc motion was witnessed approx 3 secWhile driving on southbound I-5 right before the 410 on ramp between Sumner, WA. and Puyallup, WA. on the early morning hours of August 17th, approximately 2:00 AM, my wife and I witnessed a large black, almost triangle shape object fly through the sky from east to west of our peripheral view at what appeared to be very close.(maybe a couple hundred yards away) It sounds nuts but it was almost a large batman shape.(the man not the logo) My wife and I then asked each other if we had both seen something strange to verify, to find out yes we had both seen something indeed. About 30 minutes later when we had arrived home(still confused and pale faced) we both sat down in different rooms and made a drawing of what we saw. Both pictures were quite simple and similar. We later talked about details and came to the agreement that it had no lights and little detail. Since it was dark and we were doing freeway speeds we only saw it for about 3 seconds to watch it disappear into a valley with houses behind the blocking guard rail.